2004 A/T TRANSMISSION 1st 3.520 2nd 2.043 3rd 1.401 4th 1.000 5th 0.717 Reverse 3.224 Final gear raito 4.300
2001 A/T Transmission 1st 2.826 2nd 1.493 3rd 1.000 4th 0.689 5th N/A Reverse 2.703 Final gear raito 5.125
As you can see it's more than just frist gear

If you were to put in an 04 A/T and keep your 5.12's this would set you up to run 32 or 33's right about on the money.
How ever this still does nothing for lockers or any thing like that

George